I-130 filling for Parents and siblings: What to put under "prior petitions" question

[stm 61]

Hi all, 

 

I need your input regarding I-130 online filing for Siblings/Parents of US citizen. I have hard time understanding the questions "Prior Petitions" and "Other Petitions" under the section "Other information" 

1. I already filed for Parent 1, so
   1. under "Prior Petitions" I answered no prior petitions
   2. under "other petitions" I added all sibling I am planning to file I-130 for + Parent 2
2. For Parent 2: I did not file it yet, but here what how I filled it so far:
   1. under "Prior Petitions" I answered yes I have prior petitions and I put the petition informations for Parent 1
   2. under "other petitions" I added all sibling I am planning to file I-130 for. 
3. For sibling N1 I am a little confused how to fill it:
   1. under "Prior Petitions" I answered yes I have prior petitions and I put the petition information for Parent 1. But I can't add a second petition to put Parent 2 's petition information  ==> Any idea how this should be filled? I guess my understanding for this field might be wrong, if so can you please help clarify it?
   2. under "other petitions" I added all sibling I am planning to file I-130 for except sibling N1

 

Here a capture as an example :

 

 

[stm 61]

Should I maybe use "Additional information" section for this for "prior petitions" when they are more than 1 prior petition ?
 

 

 

See capture below:

 

 

 

 

 

 

Edited July 14, 2021 by stm